EX-TEN´SION (L. _ex_, out, and _ten´do_, to stretch). The act of restoring a limb, etc., to its natural position after it has been flexed, or bent; the opposite of _Flexion_. FE-NES´TRA (L.). Literally, a window; the opening between the middle and internal ear. FI´BRIN (L. _fi´bra_, a fibre). An albuminoid substance found in the blood; in coagulating it assumes a fibrous form. FLEX´ION (L. _flec´to_, to bend). The act of bending a limb, etc. FOL´LI-CLE (L. dim. of _fol´lis_, a bag). A little pouch or depression in a membrane; it has generally a secretory function. FUN´GOUS GROWTHS (L. _fun´gus_, a mushroom). A low grade of vegetable life. GAN´GLI-ON (Gr. [Greek: ganglion], _ganglion_, a knot). A knot-like swelling in the course of a nerve; a smaller nerve-centre. GAS´TRIC (Gr. [Greek: gastêr], _gaster_, stomach). Pertaining to the stomach. GLAND (L. _glans_, an acorn). An organ consisting of follicles and ducts, with numerous blood-vessels interwoven; it separates some particular fluid from the blood. GLOS´SO-PHAR-YN-GE´AL NERVE (Gr. [Greek: glôssa], _glossa_, the tongue, and [Greek: pharunx], _pharunx_, the throat). The nerve of taste supplying the posterior third of the tongue; it also supplies the throat. GLU´TEN (L.). Literally, glue: the glutinous albuminoid ingredient of wheat. {257} GRAN´ULE (L. dim. of _gra´num_, a grain). A little grain; a microscopic object. GUS-TA´TION (L. _gus´to_, to taste) The sense of taste. GUS´TA-TO-RY NERVE. The nerve of taste supplying the front part of the tongue; a branch of the "fifth" pair. HÆM´OR-RHAGE (Gr. [Greek: haima], _hai´ma_, blood, and [Greek: rhêgnumi], _regnumi_, to burst). Bleeding, or the loss of blood. HEM-I-PLE´GIA (Gr. [Greek: hêmisus], _hemisus_, half, and [Greek: plêssô], _plesso_, to strike). Paralysis, or loss of power, affecting one side of the body. HEM´I-SPHERES (Gr. [Greek: sphaira], _sphaira_, a sphere). Half a sphere, the lateral halves of the cerebrum, or brain proper. HE-PAT´IC (Gr. [Greek: hêpar], _hepar_, the liver). Pertaining to the liver. HER-BIV´O-ROUS (L. _her´ba_, an herb, and _vo´ro_ to devour). Applied to animals that subsist upon vegetable food. HU´MOR (L.). Moisture: the humors are transparent contents of the eyeball. HY-DRO-PHO´BI-A (Gr. [Greek: hudor], _hudor_, water, and [Greek: phobeô], _phobeo_, to fear). A disease caused by the bite of a rabid dog or other animal. In a person affected with it, convulsions are occasioned by the sight of a glittering object, like water, by the sound of running water, and by almost any external impression. HY´GI-ENE (Gr. [Greek: hugieia], _huygieia_, health). The art of preserving health and preventing disease.